KBI 310745 Server Is Unreachable And Cannot Be Monitored

Version

All Argent AT products

Date

Friday, 8 Nov 2013

Summary

Target server to be monitored may have multiple network cards and hence have multiple IP addresses, usually on different subnets

When Argent resolves the server hostname through DNS, the IP address is unreachable because there is no network route to that subnet

This usually happens for servers hosting websites or intranet portals, as the hostname is used in the URL of that website which faces the DMZ and thus no network routes are configured for network security

Technical Background

Example server ‘NDCAP3‘ has three network cards and three IP addresses for separate applications

The IP address to be monitored is 177.10.13.15, but in DNS that IP is related to ‘NDCAP3.management.net

When Argent queries the DNS server for ‘NDCAP3‘, it receives the IP address in the DMZ which is unreachable causing all Relators run against that Node to fail

Resolution

Access Node Properties from CMDB-X and enter correct IP Address under ‘Alternative IP